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Issue 10, 2017
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Mechanism and performance of lithium–oxygen batteries – a perspective

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Abstract

Rechargeable Li–O2 batteries have amongst the highest formal energy and could store significantly more energy than other rechargeable batteries in practice if at least a large part of their promise could be realized. Realization, however, still faces many challenges than can only be overcome by fundamental understanding of the processes taking place. Here, we review recent advances in understanding the chemistry of the Li–O2 cathode and provide a perspective on dominant research needs. We put particular emphasis on issues that are often grossly misunderstood: realistic performance metrics and their reporting as well as identifying reversibility and quantitative measures to do so. Parasitic reactions are the prime obstacle for reversible cell operation and have recently been identified to be predominantly caused by singlet oxygen and not by reduced oxygen species as thought before. We discuss the far reaching implications of this finding on electrolyte and cathode stability, electrocatalysis, and future research needs.

Graphical abstract: Mechanism and performance of lithium–oxygen batteries – a perspective

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Article information


Submitted
06 Jun 2017
Accepted
31 Jul 2017
First published
31 Jul 2017

This article is Open Access
All publication charges for this article have been paid for by the Royal Society of Chemistry

Chem. Sci., 2017,8, 6716-6729
Article type
Perspective

Mechanism and performance of lithium–oxygen batteries – a perspective

N. Mahne, O. Fontaine, M. O. Thotiyl, M. Wilkening and S. A. Freunberger, Chem. Sci., 2017, 8, 6716
DOI: 10.1039/C7SC02519J

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    [Original citation] - Published by The Royal Society of Chemistry.

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